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4
RESULTS

Media Type
4
texts
Topics & Subjects
4
Time-signals.
3
Frequency standards.
3
Time--Systems and standards.
Collection
4
American Libraries
4
FEDLINK - United States Federal Collection
4
National Institute of Standards and Technology Research Library
4
NBS/NIST Technical Notes
Creator
3
hellwig, helmut.
1
jespersen, james l.
Language
4
English
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